The WannaCry ransomware has infected thousands of computer systems around the world. Less than a week after the WannaCry ransomwarerapidly spread across the world, a French security researcher released a tool on Thursday that gives Windows XP users a chance to decrypt and save their files from oblivion.

The tool has been created by Adrien Guinet, a French researcher from Quarkslab. He has posted the source code and the tool on GitHub to enable the victims to take advantage of its benefits.

Here’s what the developer of Wannakey had to say about his tool on the GitHub page:

This software has only been tested and known to work under Windows XP. In order to work, your computer must not have been rebooted after being infected. Please also note that you need some luck for this to work (see below), and so it might not work in every cases!”

UPDATE:Forget the above statement, this has been successfully tested with wanakiwi up to Windows 7.

Good news is that another security researcher, Benjamin Delpy, developed an easy-to-use tool called “WanaKiwi,” based on Guinet’s finding, which simplifies the whole process of the WannaCry-infected file decryption.

All victims have to do is download WanaKiwi tool from Github and run it on their affected Windows computer using the command line (cmd).